Braided cord with curve and bevel curve
So always try to spot the repetitive pattern, which seems to be this one:

Recreate it, create a plane, cut it, bevel, cut again:



Move the faces on the Y axis, duplicate and rotate 180°:


Subdivide and clean a bit:

Array on the X and on the Z axis:

Give it a Simple Deform modifier/Bend mode:

Rework the mesh:

Give it a Solidify modifier, a Bevel modifier, a Subdivision Surface modifier, scale on the Z axis, apply the modifiers you want, merge the vertices, etc...